Sodium sulfid.



E. H. STRIGKLER.

SODIUM SULFID.

APPLICATION FILED JAN. 7, 190a.

Patented Mar. 16, 1909.

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EMERSON-H. STRIGKLER, OF WHITE PLAINS, NEW'YORK, ASSIGNOR TO GENERAL CHEMICAL UOMPANY, NEW YORK, N. Y., A CORPORA'1ION 01 NEW YORK.

- SODIUM SULFID.

Specification of Letters Patent.

Patented March 16, 1909.

To all whom it may concern:

Be it known that I, EMERSON I-I. STRIOK- LER, a citizen of the United States, resident of White Plains, \Vestchcster county, State of New York, have invented certain new and useful Improvements in Sodium Sulfid, of which the followin is a specification.

My invention relates to the manufacture of sodium sulfid (N a S) and has for its object to produce it commercially at a low cost and of great purity, solubility and homogeneous ness.

At present sodium sulfid is sold in two forms for industrial purposes; as crystals, correspondin to the formula N a, S +9H,O, and as a so-cafied concentrated product, which is one solid mass (usually contained in cans) containing less water than that required to form the crystals. Both of these forms are contaminated with impurities, especially the F concentrated form, which moreover lacks homogeneousness andease of solution. The crystal form has the drawback of containing only a low proportion of sulfid (about 32% To obtain a new form of sodium sulfid which is just as rich in that chemical as the so-called concentrated sodium sulfid, and purer than either the concentrated or crystalline sodium sulfid, while just as soluble as the latter, I proceed as set forth hereinafter, making use, for instance, of an apparatus such as shown in the accompanying draw-' ings in which Figure 1 is a side elevation of such apparatus, with parts in section, and Fig. 21s an end elevation thereof, with parts in section.

To the shaft A which is driven by means of a belt ulley A or otherwise is secured a metal roller or drum B, said drum being hollow and the shaft tubular with connections to circulate water or other cooling fluid through the drum, as indicated in Fig. 2. The lower portion of the drum dips into a hot melt of (impure) sodium sulfid (Na S) contained in a pan C to which the sulfid is supplied, preferably constantly, through a pipe C or otherwise.

At one side-of the pan,

adjacent to the periphery of the drum B, is located a scraper D, and next to it a chute E leading to a receptacle F.

The drum B is rotated in the direction in dicated by the arrow, so as to pick up the fused or molten sodium sulfid from the an O and carry it toward the scraper D. he sodium sulfid should be concentrated to or higher, such molten concentrated sulfid being supplied through the pipe 0 at the same ratio as the drum removes it from the pan. If concentrated to 60% (by weight) 60 the sulfid melts at about 183 F. A thin film of material is gathered on the surface of the drum, and by contact with the air and by the influence of the cooling fluid within the drum this material is rendered solid and brittle by the time it reaches the scraper D, it being understood that the rotary speed of the drum is adjusted accordingly. In this condition, the solidified material is easily peeled off the drum and broken by the scraper, so as to slide into the receptacle F through the chute E.

The product obtained consists of fiat pieces (flakes) or laminae, which contain 60% or more of Na S, are homogeneous in composition, and very readily soluble without. re-' quiring to be-broken up for this purpose, the edges broken irregularly by the scraper affordin a large surface to the solvent. "K?

"genera ly obtained, this product is (listin- 8o guished by a uniform brick-red color.

The urity of the product is very high, and this is ue to the fact that the drum B gathers material only from the top of the fused or molten sulfid, the upper layers being almost absolutelypure. The foreign matters present in the melt (chiefly oxidized salts, sodium thio sulfate, sodium sulfate, sodium carbonate, etc.,) gradually preci itate and settle out. They can be remove from time to. time or continuously, through a valve G;

The rapid cooling of the material gathered by the drum, is an important feature, since segregation and oxidation are thus avoided, securing a pure product of uniform composition.

Q t M I claim as m in ention'z In witness whereof I have hereunto set my The herem escrlbed new forrn of sodium hand in the presence of two witnesses, this H] sulfid consisting of flakes or laminae of great 31st day of December 1907.

urity and solubility said laminae being of g 5 homogeneous composition and-containin a EMERSON STRICKLER' high percentage of N a,S, with a sma er Witnesses: amount of water than requiredfor the crys- JOHN LOTKA,

tallization of said N a,S as N a,S+9H,O. JOHN A. KEHLENBECK. 

